An oil flowing on water seems coloured due to interference. For observing this effect, the approximate thickness of the oil film should be
|
(a) 100 Å |
(b) 10000 Å |
(c) 1 mm |
(d) 1 cm |
(b) 10000 Å
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An electron and a proton are at a distance of 1
. The moment of this dipole will be (C X m)
|
(a) 1.6 |
(b) 1.6 |
(c) 3.2 |
(d) 3.2 |
$\text{v}_1=\text{v}_2$
$\text{v}_1=13.6\text{v}_2$
$\text{v}_1=\frac{\text{v}_2}{\text{13.6}\cdot}$
$\text{v}_1=\sqrt{13.6}\text{v}_2$
An astronomical refractive telescope has an objective of focal length 20m and an eyepiece of focal length 2cm.
Which of the following statements about the Bohr model of the hydrogen atom is false
|
(a) Acceleration of electron in n = 2 orbit is less than that in n = 1 orbit |
|
(b) Angular momentum of electron in n = 2 orbit is more than that in n = 1 orbit |
|
(c) Kinetic energy of electron in n = 2 orbit is less than that in n = 1 orbit |
|
(d) Potential energy of electron in n = 2 orbit is less than that in n = 1 orbit |
For what value of unknown resistance X, the potential difference between B and D will be zero in the circuit shown in the figure
|
(a) 4 W |
(b) 6 W |
(c) 2 W |
(d) 5 W |
The focal length of lens of refractive index 1.5 in air is 30 cm. When it is immersed in a liquid of refractive index 
, then its focal length in liquid will be
|
(a) 30 cm |
(b) 60 cm |
(c) 120 cm |
(d) 240 cm |
